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Why doesn't Objective-C support private methods?
... were private; i.e. this could be achieved by adding a private-only method table to the Class structure.
There would be no way for a private
method to short-circuit this check or
skip the runtime?
It couldn't skip the runtime, but the runtime wouldn't necessarily have to do any...
IN vs OR in the SQL WHERE Clause
...tion Plan.
I tried it with Oracle, and it was exactly the same.
CREATE TABLE performance_test AS ( SELECT * FROM dba_objects );
SELECT * FROM performance_test
WHERE object_name IN ('DBMS_STANDARD', 'DBMS_REGISTRY', 'DBMS_LOB' );
Even though the query uses IN, the Execution Plan says that it u...
PDO's query vs execute
... execution. Which means you can do:
$sth = $db->prepare("SELECT * FROM table WHERE foo = ?");
$sth->execute(array(1));
$results = $sth->fetchAll(PDO::FETCH_ASSOC);
$sth->execute(array(2));
$results = $sth->fetchAll(PDO::FETCH_ASSOC);
They generally will give you a performance impr...
Width equal to content [duplicate]
...elements with "clearfix" div.
Another elegant solution is to use display: table for elements.
With this solution you don't need to insert line breaks manually (like with inline-block), you don't need a wrapper around your elements (like with floats) and you can center your element if you need.
ht...
What is the difference between a HashMap and a TreeMap? [duplicate]
...y works with Comparable objects, HashMap only works with objects with a suitable hashCode() implementation.
– Thilo
Mar 15 '10 at 1:29
11
...
how to get the host url using javascript from the current page
... Good. But what happens when the MDN guys update the browser compatibility table, which happens pretty often with newer browser releases. You might need to keep on updating this to sync with their table ;).
– kabirbaidhya
Apr 5 '17 at 5:38
...
Entity Framework 4 vs NHibernate [closed]
...hat EF4 has more flexible inheritance mapping. For instance, you can use 2 tables (TPT) as base class + level 1 class and add discriminator to level 1 table, allowing spliting to level 2 classes. In NH, discriminator can only be defined on base class.
– Danny Varod
...
Difference between “!==” and “==!” [closed]
...
I fell under the same illusion of being able to use a <table>.
– Chad Harrison
Sep 7 '12 at 15:27
...
Creating a constant Dictionary in C#
...y a nice one; remember that according to the C# specification, switch-case tables are compiled to constant hash jump tables. That is, they are constant dictionaries, not a series of if-else statements. So consider a switch-case statement like this:
switch (myString)
{
case "cat": return 0;
ca...
Why does Sql Server keep executing after raiserror when xact_abort is on?
...nd executes a stored procedure that we assume will fail:
assume we have a table [dbo].[Errors] to hold errors
assume we have a stored procedure [dbo].[AssumeThisFails] which will fail when we execute it
-- first lets build a temporary table to hold errors
if (object_id('tempdb..#RAISERRORS') is nu...